TDA2822 IC Overveiw
TDA2822 is a dual low-voltage power amplifier in an 8-lead Minidip package, ideal for portable audio devices like cassette players and radios. It operates at 1.8-15V, with low quiescent current (typ. 6mA) for energy efficiency. Supporting stereo or bridge configurations, it delivers flexible output power: stereo mode offers 5-1000mW per channel (depending on load/voltage), while bridge mode reaches up to 2000mW. Distortion is as low as 0.2% (1kHz), ensuring clear audio. With 39dB closed-loop gain, 100kΩ input resistance, and 50dB channel separation, it maintains high fidelity. Low noise (2-3µV) and good supply rejection enhance performance, making it suited for battery-powered audio systems.
TDA2822 Pinout
| Pin No. |
Pin Name |
Description |
| 1,3 |
Output |
Provides the amplified Audio output |
| 5,8 |
Inverting Input (IN-) |
The Inverting Pin of an amplifier is normally grounded |
| 6,7 |
Non-Inverting Input (IN+) |
The Non-Inverting pin is provided with the audio signal |
| 4 |
Vcc- |
Connected to the negative supply rail |
| 2 |
Vcc+ |
Connected to Positive Supply Rail |
TDA2822 CAD Model
TDA2822 IC Specifications
| Class: |
Class-AB |
| Output Power: |
3.2 W |
| Mounting Style: |
Through Hole |
| Type: |
1-Channel Mono or 2-Channel Stereo |
| Package / Case: |
PDIP-16 |
| Audio - Load Impedance: |
8 Ohms |
| THD plus Noise: |
0.2 % |
| Supply Voltage - Max: |
15 V |
| Supply Voltage - Min: |
3 V |
| Minimum Operating Temperature: |
- 40 C |
| Maximum Operating Temperature: |
+ 150 C |
| Packaging: |
Tube |
| Brand: |
STMicroelectronics |
| Description/Function: |
Headphone/Speaker |
| Gain: |
39 dB |
| Height: |
4.59 mm |
| Ib - Input Bias Current: |
100 nA |
| Input Type: |
Single |
| Length: |
20 mm |
| Number of Channels: |
2 Channel |
| Operating Supply Current: |
12 mA |
| Operating Supply Voltage: |
5 V, 9 V, 12 V |
| Output Current: |
1.5 A |
| Output Signal Type: |
Differential, Single |
| Output Type: |
1-Channel Mono, 2-Channel Stereo |
| Pd - Power Dissipation: |
4 W |
TDA2822 IC Features
- Wide Voltage Range: Operates from 1.8V to 15V, enabling compatibility with battery-powered devices (e.g., portable cassette players, radios).
- Low Power Consumption: Typical quiescent current of 6mA (max 9mA), minimizing power usage to extend battery life.
- Flexible Output Power: Supports stereo or bridge configurations. In stereo mode, output power per channel ranges from 5mW to 1000mW (depending on load/voltage, e.g., 300mW @ 32Ω/9V, 1000mW @ 8Ω/9V). In bridge mode, it delivers up to 2000mW (e.g., 1350mW @ 8Ω/6V, 1000mW @ 4Ω/4.5V).
- Low Distortion: Total harmonic distortion (THD) is typically 0.2% at 1kHz (under various load/power conditions), ensuring high-fidelity audio.
- Stable Gain Performance: Closed-loop voltage gain is 36–41dB (typ. 39dB) at 1kHz, with channel balance within ±1dB, maintaining consistent audio output between channels.
- Low Noise & High Input Impedance: Total input noise is 2–3µV (22Hz–22kHz), preserving signal clarity; input resistance is 100kΩ, suitable for audio signal input.
- Good Power Supply Rejection: Supply voltage rejection ratio (SVR) is 30dB (stereo mode) and 40dB (bridge mode) at 100Hz, reducing interference from power ripples.
- Thermal & Operational Reliability: Storage and junction temperature range from –40°C to +150°C; thermal resistance (junction-pin) is max. 70°C/W, ensuring stable operation under varying temperatures.
- Versatile Configuration: Supports stereo (dual-channel) or bridge modes, adapting to diverse audio system needs (e.g., stereo speakers or single high-power speakers).
Working Principle of TDA2822 Amplification
The TDA2822 is a dual-channel audio power amplifier IC with a core principle centered on:
- Signal Conditioning: Weak audio signals enter through differential input stages that suppress common-mode noise and refine the signal.
- Amplification Stages: After pre-amplification to boost signal amplitude, a Class-AB output stage (dual NPN/PNP push-pull configuration) delivers power amplification to drive speakers/headphones.
- Feedback Stability: Internal negative feedback stabilizes the closed-loop gain (~39 dB) and reduces total harmonic distortion (THD) to ≤0.2%, ensuring audio fidelity.
Modes & Efficiency:
- Stereo Mode: Two independent channels for dual-channel audio (left/right separation).
- BTL Bridge Mode: Push-pull operation of both channels, doubling voltage swing for 4x power gain (e.g., 350mW @ 3V BTL).
- Wide Voltage Range: 1.8–15V compatibility suits portable devices, paired with a 6mA quiescent current for energy-efficient battery operation.
This architecture balances power, low distortion, and versatility, making it ideal for portable audio systems.
TDA2822 Application Circuit
TDA2822 Applications in Portable Players
TDA2822 suits portable players like Walkmans, MP3s, and radios. With 1.8–15V wide voltage, low 6mA quiescent current, it fits battery-powered setups. Supporting stereo/BTL modes, it drives headphones/small speakers with low distortion. Its simple peripheral circuit and thermal stability enable compact integration, delivering clear audio for on - the - go music playback.
TDA2822 IC Stereo Amplifier Circuit
This is a TDA2822 - based stereo amplifier circuit. It features left/right audio inputs, with TDA2822 (IC1) as the core to amplify signals. Components like 1000μF coupling caps (C1/C2), 4.7Ω resistors (R1/R2) with small caps for filtering, and 10KΩ resistors (R3/R4) + 100μF caps for biasing work together. It drives 4Ω speakers (K1/K2), suited for portable low - power audio setups.
TDA2822 Bridged Mode Amplifier Circuit
This TDA2822 bridged (BTL) mode circuit merges two internal channels to drive a single 4Ω speaker (K3). A single audio input (IN) is biased by R7 (10K). C12 filters the +V supply, while R5/R6 and capacitors (C8/C10, etc.) match the load, boosting power output for mono portable audio setups.
Use motor speed control and TDA2822 to enhance a 3V stereo cassette player
This circuit uses TDA7282 for pre - amp, TDA2822M for power amp to drive 3V stereo cassette. TDA7276 controls motor speed. Components like caps and resistors filter, amplify signals. It boosts audio quality and stabilizes motor, enhancing playback for portable cassette players.
Stereo amplifier circuit and PCB layout
The figures below show the PCB layout and component layout of a stereo amplifier circuit using the TDA2822M. After connecting the circuit, install it in a suitable box. Fix the VR1 and VR2 potentiometers on the front panel of the box to control the left and right volume respectively. On the printed circuit board, use an 8 - pin IC socket for the TDA2822M so that the IC can be easily removed during troubleshooting.
TDA2822 IC Applications
TDA2822 IC (specifically TDA2822M) is primarily designed as a dual low-voltage audio power amplifier, with applications focused on portable audio devices, leveraging its low voltage operation, low power consumption, and flexible configuration. Key applications include:
- Portable Cassette Players: As a core audio amplification component, it drives speakers or headphones in portable cassette players, supporting stereo sound output with low distortion (Figure 16, Figure 21).
- Portable Radios: Used in portable radio receivers (AM/FM) to amplify audio signals, compatible with radio tuners (e.g., TDA7220, TEA1330) and supporting stereo or mono output based on configuration (Figure 17, Figure 19).
- Portable Radio-Cassette Players: Integrated in devices combining radio and cassette functions, coordinating with preamplifiers (e.g., TDA7252) and tuners to handle both radio and tape audio amplification (Figure 18).
- Low-Cost Portable Audio Devices: Suitable for budget-friendly portable players, with simplified circuit designs (e.g., using only one 100µF output capacitor) to reduce component costs while maintaining basic audio performance (Figure 20).
- Battery-Powered Stereo Systems: Its wide supply voltage range (1.8V–15V) and support for stereo/bridge modes make it ideal for small-scale stereo setups in portable devices, driving speakers with impedances from 4Ω to 32Ω.
These applications capitalize on its low quiescent current (extending battery life), low distortion (ensuring sound clarity), and flexible power output (adapting to different speaker/headphone requirements).
TDA2822 IC Alternatives
| Equivalent ICs |
Package |
Typical Application |
Features |
| NJM2073 |
8-pin DIP/SOP |
Audio Amplifier |
Low Quiescent Current, BTL Function |
| KA2206B |
8-pin DIP/SOP |
Stereo Audio Amplifier |
BTL Function, Low Distortion |
| LM4871 |
8-pin DIP/SOP |
Portable Audio Devices |
Low Quiescent Current, Thermal Shutdown |
| TA8210AH |
12-pin SIP |
Automotive Audio Amplifier |
High Output Power, Thermal Protection |
| AN7158 |
12-pin SIP |
Audio Amplifier |
BTL Function, Low Noise |
TDA2822 IC Package
| DIM. |
mm |
inch |
|
|
|
|
| |
MIN. |
TYP. |
MAX. |
MIN. |
TYP. |
MAX. |
| a1 |
0.51 |
|
|
0.020 |
|
|
| B |
0.85 |
|
1.40 |
0.033 |
|
0.055 |
| b |
|
0.50 |
|
|
0.020 |
|
| b1 |
0.38 |
|
0.50 |
0.015 |
|
0.020 |
| D |
|
|
20.0 |
|
|
0.787 |
| E |
|
8.80 |
|
|
0.346 |
|
| e |
|
2.54 |
|
|
0.100 |
|
| e3 |
|
17.78 |
|
|
0.700 |
|
| F |
|
|
7.10 |
|
|
0.280 |
| I |
|
|
5.10 |
|
|
0.201 |
| L |
|
3.30 |
|
|
0.130 |
|
| Z |
|
|
1.27 |
|
|
0.050 |
Conclusion
TDA2822 IC is a standout for audio systems. Its 1.8–15V low-voltage range fits battery-powered devices, 0.2% low distortion ensures clear sound, and dual modes (stereo/bridge) boost adaptability, delivering 5–1000mW across 4–32Ω loads. With 39dB stable gain, 50dB channel separation, and 6mA low quiescent current, it balances performance and efficiency, ideal for portables.
If you’re selecting models from this series, contact us for the latest quotes to meet your audio system needs.
